Composition and process for the oxidative dyeing of hair

Claim 2

A process for the oxidative dyeing of human hair, comprising the steps of applying an amount sufficient for dyeing the hair of a composition for oxidative dyeing of human hair comprising 0.1 to 5.0% by weight of a compound of the general formula ##STR5## wherein R represents H, OH, R' or OR', and R' represents an alkyl group having 1-5 carbon atoms, and the usual cosmetic additives for hair dyeing, with a pH value of 7.0-8.5 onto the hair, allowing the hair dyeing composition to remain on the hair for approximately 10-20 minutes at a temperature of 20°-40° C., applying an amount sufficient for oxidizing the compound of formula (i) of an approximately 1-8% alkaline solution of hydrogen peroxide or ammonium peroxodisulfate, leaving the solution on the hair for a further 10-20 minutes at the same temperature, and washing the hair with water.

Claim 3

The process according to claim 1, wherein the composition for oxidative dyeing of human hair further comprises 0.1-1 mol relative to 1 mol of the compound of formula (i) of at least one compound selected from the group consisting of orcin, hydroquinone, pyrogallol, hydroxyhydroquinone, protocatechualdehyde, thymol, guajacol, arbutin, pyrocatechol, juglone, lawsone, caffeic acid, chlorogenic acid, pulvinic acid, hydroxycoumarin, 3-hydroxy-anthranilic acid, kynurenic acid, xanthurenic acid, dopa and tyrosine.

Claim 4

A process for the oxidative dyeing of human hair, comprising the steps of applying an amount sufficient for dyeing the hair of a composition for oxidative dyeing of human hair comprising 0.1-5.0% by weight of a compound of the general formula ##STR6## wherein R represents H, OH, R' or OR', and R' represents an alkyl group having 1-5 carbon atoms, and the usual cosmetic additives for hair dyeing, with a pH value of 2-4, onto the hair, allowing the hair dyeing composition to remain on the hair for approximately 10-20 minutes at a temperature of 20°-40° C., applying onto the hair a neutral solution of hydrogen peroxide or ammonium peroxodisulfate in an amount sufficient for oxidizing the compound of formula (i), leaving said solution on the hair for approximately 5-15 minutes, applying onto the hair a 5-10% ammonia solution, leaving the solution on the hair for approximately 15 minutes, and washing the hair with water.

Claim 5

A process for the oxidative dyeing of human hair, comprising the steps of applying an amount sufficient for dyeing the hair of a composition for oxidative dyeing of human hair comprising 0.1-5.0% by weight of a compound of the general formula ##STR6## wherein R represents H, OH, R' or OR', and R' represents an alkyl group having 1-5 carbon atoms, and the usual cosmetic additives for hair dyeing, with a pH value of 2-4, onto the hair, allowing the hair dyeing composition to remain on the hair for approximately 10-20 minutes at a temperature of 20°-40° C., applying onto the hair a neutral solution of hydrogen peroxide or ammonium peroxodisulfate in an amount sufficient for oxidizing the compound of formula (i), leaving said solution on the hair for approximately 5-15 minutes, applying onto the hair a 5-10% ammonia solution, leaving the solution on the hair for approximately 15 minutes, and washing the hair with water.